Scan formatted input from stdin. Use the -l c option to qcc to link against this library. This library is usually included automatically. The scanf function scans input from stdin under control of the format argument, assigning values to the remaining arguments.

scanf, _scanf_l, wscanf, _wscanf_l

The format control string consists of zero or more format directives that specify what you consider to be acceptable input data. Subsequent arguments are pointers to various types of objects that the function assigns values to as it processes the format string. A format directive can be a sequence of one or more whitespace characters or:. As each format directive in the format string is processed, the directive may successfully complete, fail because of a lack of input data, or fail because of a matching error as defined by the directive.

If end-of-file is encountered on the input data before any characters that match the current directive have been processed other than leading whitespace, where permitted , the directive fails for lack of data.

If end-of-file occurs after a matching character has been processed, the directive is completed unless a matching error occurs , and the function returns without processing the next directive. If a directive fails because of an input character mismatch, the character is left unread in the input stream.

Trailing whitespace characters, including newline characters, aren't read unless matched by a directive. When a format directive fails, or the end of the format string is encountered, the scanning is completed, and the function returns.

If no whitespace characters are found in the input data, the scanning is complete, and the function returns.

c - scanf optional matching - Stack Overflow

An ordinary character in the format string is expected to match the same character in the input stream. If the sequence contains more than 8 digits, the conversion is performed only on the last 8 digits in the sequence. The conversion specification includes all characters in the scanlist between the beginning [ and the terminating ].

This range consists of characters numerically greater than or equal to the character before the - , and numerically less than or equal to the character after the -. A conversion type specifier other than those listed above causes scanning to terminate, and the function to returns with an error.

The number of input arguments for which values were successfully scanned and stored, or EOF if the scanning stopped by reaching the end of the input stream before storing any values. The return value is 3.

c - Skipping optional scanf parameters - Stack Overflow

To scan a date in the form "Friday March 26 ":. ANSI , POSIX Scan formatted input from stdin Synopsis: The formatting string determines what additional arguments you need to provide.

The scanf function is generally considered unsafe for string handling; it's safer to use fgets to get a line of input and then use sscanf to process the input. They may look alike, but they don't perform alike. To scan a date in the form "Friday March 26 ": Cancellation point Yes Interrupt handler No Signal handler No Thread Yes.